Gastrostomy tube extension device

ABSTRACT

A gastrostomy tube extension device used for inserting or taking out the gastrostomy tube into/from the hole on the patient includes a rod, a fixing member, and an engaging member. The rod is formed of a rod-shaped member, and may be formed with engaging stepped portions on the proximal portion thereof. The fixing member is adapted to be capable of moving along the longitudinal direction of the rod, and an engaging projection which can be fixed to the tube member is formed on the peripheral surface of the fixing member. The engaging member includes a lower engaging portion engageable with the engaging projection and an upper engaging portion which is engageable with the engaging stepped portion. This assembly allows the extension to be locked, allowing the operator to manipulate the device with a single hand.

This application is a 35 U.S.C. 371 of PCT/EP05/04659, filed on Apr. 29,2005 which claims the foreign priority of Japanese Patent ApplicationSerial No. 2004-135310 filed on Apr. 30, 2004, the disclosures of whichare incorporated herein by reference.

TECHNICAL FIELD

The present invention relates to a gastrostomy tube extension device forinserting or removing a gastrostomy tube used for feeding fluidsubstances such as liquid food into a stomach of a patient into/from thepatient' body.

BACKGROUND ART

Hitherto, feeding of the fluid substances such as the liquid food ornutrient preparation using the gastrostomy tube has been carried out forpersons whose capability to take food orally by their own abilities isdeteriorated due to aging or diseases (hereinafter referred to as a“patient”). The gastrostomy tube includes a stomach interior fixingmember to be installed on the inside of a stomach wall at a hole (agastric fistula) for dietary intake formed on the abdomen of thepatient, and a tube member connected to the stomach interior fixingmember at the distal portion thereof and extends through the hole towardthe outside of the patient at the proximal portion. When inserting thegastrostomy tube into the hole formed on the patient's body, theoperation for insertion is performed by a rod-shaped extender, such asthat disclosed in JP-A-2003-275325.

The stomach interior fixing member of the gastrostomy tube is formedinto a bowl shape, with a through hole through which the extender can bepassed through a part in the vicinity of a joint member joining theextender with the tube member. When the extender is passed through thethrough hole of the gastrostomy tube from the outside and is pushedtoward the distal portion of the stomach interior fixing member, thedistal portion of the extender is hooked on the inner side of thestomach interior fixing member, and is used to push the interior fixingmember into an elongated and narrowed state. Since the stomach interiorfixing member in the narrowed state can pass through the hole formed onthe abdominal part of the patient, the gastrostomy tube can be placed inthe hole simply by inserting the stomach interior fixing member into thestomach. After inserting the stomach interior fixing member into thestomach, the extender is removed from the body.

When the gastrostomy tube is to be removed from the body, the usersimply pulls on the tube member. In this case, the stomach interiorfixing member is bent and contracted in a certain direction by thethrough hole, allowing it to be removed from the hole.

However, in the gastrostomy tube described above, resistance of thestomach interior fixing member is significant and hence the removal isdifficult, painful, and likely to cause damage to the abdominal part ofthe patient. In addition, when inserting the gastrostomy tube into thehole formed on the patient's body, it is necessary for the user tomanually press the extender against the stomach interior fixing member,and maintain this pressure constantly throughout the procedure.Complexity places a large burden on the operator.

DISCLOSURE OF THE INVENTION

In order to solve the above-described problems, it is an object of thepresent invention to provide a gastrostomy tube extension device whichcan easily be inserted or taken out.

In order to achieve the above-described object, the gastrostomy tubeextension device includes: an extender formed of a rod-shaped memberwhich can be inserted into a tube member of the gastrostomy tube and canelongate and narrow the stomach interior fixing member of thegastrostomy tube by pushing the distal end of the stomach interiorfixing member in the distal direction with the distal end of theextender. A fixing member is fixed to the outside end of the tube memberand inserted into the tube member which is capable of moving along thelongitudinal direction of the extender. An engaging portion isengageable with the fixing member; and an engaging member having aholding portion, to be held by hand, elongates and narrows the stomachinterior fixing member when pulled in the direction of the outside endof the tube in a state in which the extender is inserted into the tubemember and the engaging portion is engaged with the fixing member fixedto the outside end of the tube member.

The fixing member is to be fixed on the outside end of the tube memberwhich is located out of the body, and the engaging member having anengaging portion, is capable of being engaged to the fixing member. Thefixing member is capable of moving along the longitudinal direction ofthe extender. When the extender is inserted into the tube member and thetube member and the fixing member are engaged with each other, thestomach interior fixing member can be narrowed by holding the holdingportion and pulling the engaging member in the proximal direction

The gastrostomy tube can be removed easily without damaging the abdomenof the patient. When the gastrostomy tube is inserted into the hole onthe patient, the thickness of the stomach interior fixing member can beeasily held constant, since the holding portion is provided on theengaging member. In this manner, the operator who performs the insertionor removal of the gastrostomy tube need concentrate only on theinsertion or removal operation itself, without paying attention to theextended state of the gastrostomy tube, even when using only one hand,thus facilitating insertion and removal of the gastrostomy tube. Theholding portion may be of various shapes as long as it can be hand-heldfor operation.

Another structural characteristic of the gastrostomy tube extensiondevice according to the present invention is that the fixing member ishollow cylindrical, capable of moving along the longitudinal directionof the extender when surrounding the outer peripheral surface of theextender, and the cylindrical member is provided with a fixed portion tobe fixed at the outside end of the tube member, and an engaged portionto be engaged the engaging portion of the engaging member. In thisarrangement, since the fixing member moves precisely along thelongitudinal direction of the extender, the direction of extension ofthe gastrostomy tube and the longitudinal direction of the extender arealigned in a straight line. Therefore, deformation in the direction ofextension of the gastrostomy tube is prevented, and the insertion orremoval operation can be performed while keeping the gastrostomy tube ina proper state.

In another arrangement the fixed portion is formed with a projectionwhich is formed on the outer peripheral surface of the cylindricalmember so as to be capable of being press-fitted into the tube member.In other words, the fixed portion can be fixed to the tube member merelyby inserting the cylindrical member into the tube member, which improvesthe ease of use.

By employing a longer cylindrical member, the contact surface withrespect to the cylindrical member increases, and hence excessiveextension of the tube member does not occur, and a force exerted to theextender or the engaging member is efficiently used for extension of thestomach interior fixing member. The projection formed on the cylindricalmember may be either single or plural.

The projection which comprises the fixed portion may be formed on theouter peripheral surface of the cylindrical member all along thecircumference thereof, having a tapered portion with a diameter which issmaller toward the distal end when press-fitted into the tube member andgradually increases toward the proximal end. In this arrangement, thefixed portion can be more easily inserted into the tube member, andafter fixing the tube member and the fixed portion, it is difficult todisconnect the fixed portion from the tube member. Therefore, thegastrostomy tube can be extended in a stable state.

In another arrangement, the engaged portion may comprise a projectionwhich constitutes the fixed portion, and the engaging portion of theengaging member is adapted to engage the outer peripheral surface of thetube member, through which the cylindrical member is press-fitted to fixthe fixed portion, at a portion corresponding to the engaged portion. Inthis arrangement, the fixed portion to be fixed to the tube member ofthe fixing member and the engaged portion to be engaged to the engagingmember are a unitary structure, thus simplifying the device. Inaddition, since the engaging portion of the engaging member engages theouter peripheral surface of the tube member which fixes the fixedportion, the engaging portion presses the tube member to ensure fixationbetween the tube member and the fixed portion.

A positioning portion may be provided on the peripheral surface of theproximal portion of the extender, and a positioned portion which canengage the positioning portion may be provided on the engaging member sothat with the extender inserted into the tube member, the stomachinterior fixing member is elongated and narrowed when the fixing memberis engaged with the engaging portion and the positioning portion isengaged with the positioned portion respectively. In this arrangement,after engagement of the fixing member with the engaging portion and thepositioning portion with the positioned portion respectively, even whenthe operator releases his/her hand from the holding portion of theengaging member, the stomach interior fixing member is maintained at aconstant narrow width. Therefore, the operator who performs theinserting or removal operation of the gastrostomy tube can concentrateonly on the insertion or removal operation without paying attention tothe extended state of the gastrostomy tube.

A plurality of positioning portions may be formed along the axialdirection of the extender. In this arrangement, the extended state ofthe gastrostomy tube can be modified by selecting the positioningportion of the extender to which the positioned portion of the engagingmember is engaged as needed. Accordingly, versatility is provided, andhence one type of gastrostomy tube extension device may be sufficient.In this arrangement, adaptation can be made to change in the expansionor other physical properties of the gastrostomy tube.

For example, when inserting the gastrostomy tube into the hole on thepatient, the positioned portion of the engaging member is engaged withthe positioning portion which provides the minimum extension of thegastrostomy tube before operation. Then, when the gastrostomy tube istaken out from the hole on the patient after having been left in thepatient's body for a predetermined period, the operation can beperformed with the positioned portion engaged with another positioningportion. Accordingly, the operation can be performed with thegastrostomy tube expanded optimally for each operation.

The extender may comprise a rod-shaped member which can be inserted intothe tube member and can elongate and narrow the stomach interior fixingmember by pushing the distal end of the stomach interior fixing membertoward the distal side by the distal end of the extender.

In this arrangement, the structure of the fixing portion can be greatlysimplified. For example, a structure in which a cylindrical orring-shaped member is fixed on the outer peripheral surface of the tubemember may be sufficient. It is also possible to provide a recess or thelike on the outer peripheral surface of the tube member as a fixingportion. Therefore, manufacturing of the fixing portion is facilitated,and the cost of the gastrostomy tube extension device can be reduced. Inthis case, the operator can operate the device by holding the fixingportion formed on the tube member by hand while the extender is insertedin the gastrostomy tube. It is also possible to provide an engagingmember including an engaging portion capable of engaging the fixingmember and the holding portion for holding by hand to operate thedevice, elongating the stomach interior fixing member when the holdingportion is pulled in the direction of the outside portion of the tubemember when the extender is inserted into the tube member and theengaging portion is engaged with the fixing member fixed to the outsideend of the tube member.

In this case as well, it is possible to form a positioning portion onthe peripheral surface of the proximal portion of the extender, andprovide a positioned portion, which is capable of engaging thepositioning portion, on the engaging member, so that when the extenderis inserted into the tube member, the stomach interior fixing member canbe elongated and narrowed when the fixing portion is engaged with theengaging portion and the positioning portion is engaged with thepositioned portion respectively. In addition, a plurality of positioningportions can be provided along the axial direction of the extender.

The device may include a movable fixing member comprising a fixingportion which is capable of being fixed to the outside end of the tubemember and a holding portion to be held by hand for operation of thedevice, and which is movable along the longitudinal direction of theextender inserted into the tube member.

In this case, the fixing portion to be fixed to the outside end of thetube member and the holding portion held by hand for operation of thedevice are provided on a single movable fixing member. The movablefixing member is movable along the longitudinal direction of theextender. Therefore, when the extender is inserted into the tube member,by holding the holding portion and pulling the movable fixing member inthe direction opposite to insertion of the extender, the stomachinterior fixing member can be narrowed. In this arrangement as well, thegastrostomy tube can be taken out without damaging the abdomen of thepatient, and the insertion of the gastrostomy tube into the hole on thepatient or the removal operation of the gastrostomy tube from the holecan be performed easily. In this case, since the number of members whichconstitute the gastrostomy tube extension device is reduced, manufacturecan be facilitated and the cost is reduced.

Furthermore, the fixing portion of the movable fixing member may behollow cylindrical, movable along the longitudinal direction of theextender when surrounding the outer peripheral surface of the extender,and the cylindrical member can be provided with the fixed portion to befixed on the outside end of the tube member. Also, the fixed portion maybe formed on the outer peripheral surface of the cylindrical member,comprising projections which can be press-fitted into the tube member.In addition, a projection which constitutes a fixed portion may beformed on the outer peripheral surface of the cylindrical member allalong the circumference thereof, and may be formed of a tapered portionwith a cross section diameter which is smaller toward the distal endwhen press-fitted into the tube member and gradually increases towardthe proximal end. The projection may be single or plural.

In this arrangement, since the direction of movement of the movablefixing member matches the longitudinal direction of the extender, thereis no difference between the direction of extension of the gastrostomytube and the direction of movement of the movable fixing member, andhence the insertion or removal-operation can be performed with thegastrostomy tube extended in an adequate state. Also, a stable fixationbetween the tube member and the fixed portion of the movablefixing-member is further ensured. In addition, when fixing the tubemember to the fixed portion, the cylindrical member can easily beinserted into the tube member, and after having inserted the cylindricalmember into the tube member and fixing the tube member to the fixedportion, it is difficult to disconnect the cylindrical member from thetube member.

The gastrostomy tube extension device according to the present inventionmay comprise a tightening member for tightening the outer peripheralsurface of the tube member through which the cylindrical member ispress-fitted in order to strengthen the fixation of the fixed portion tothe tube member. The tightening member in this case may be provided byforming a threaded portion on the cylindrical member of the fixedportion, and providing a round tubular member formed with a thread atthe upper portion of the inner periphery thereof which can be attachedto and detached from the above threaded portion, and the outerperipheral surface of the tube member can be tightened by the lowerportion of the inner peripheral surface of this member. It is alsopossible to provide a tightening member in the form of a clip. Thetightening member if of particular significance when the length of thecylindrical member is set to be short.

Where a movable fixing member is provided with a positioned portionwhich can engage the positioning portion, which may be a plurality offixing portions, the positioning portions are a plurality of projectionsformed along the axial direction of the extender and the positionedportion is constituted of the cylindrical member formed of resilientmaterial, so that the positioned portion can be engaged to one specificpositioning portion.

In this arrangement, the stomach interior fixing member can bemaintained in a constant narrow width, thus improving the ease ofoperation. Also, the narrowness of the gastrostomy tube can be modified.In addition, since engagement between the positioned portion and thepositioning portion can be achieved simply by inserting the cylindricalmember formed with the positioned portion onto the positioning portionon the extender, the ease of operation is further increased, and thestructure is simple and low-cost.

BEST MODE FOR CARRYING OUT THE INVENTION First Embodiment

Referring to drawings 1 through 6, a first embodiment of the presentinvention will be described. FIG. 1 shows a state in which a gastrostomytube extension device 20 according to the first embodiment of thepresent invention is mounted to a gastrostomy tube 10. The gastrostomytube 10 includes a tube member 11 formed of polyurethane as shown inFIG. 2, and a stomach interior fixing member 12 connected to the lowerend of the tube member 11. In the following description, the side of thetube member 11 is referred to as the upper side, and the side of thestomach interior fixing member 12 is referred to as the lower side.

The interior of the tube member 11 is formed into a feed path 13 of ahole for allowing fluid substances such as liquid food to pass through.The tube member 11 has elasticity, and hence is extended when pulled,and returns to its original state when the pulling force is removed. Thetube member 11 has a function to block the hole by being fixed in thehole when the gastrostomy tube 10 is placed in the hole (not shown)formed on the abdominal part of a patient, and prevent the liquid or thelike from leaking from inside the stomach.

The stomach interior fixing member 12 includes a cylindrical jointmember 14 joined to the lower end of the tube member 11, and an innerholding strip 15 joined to the opening edge at the lower end of thejoint member 14. The joint member 14 is formed into a cylindrical shapeso as to cover the lower end portion of the outer peripheral surface ofthe tube member 11, and is fixed to the tube member 11 in a state inwhich the lower end of the tube member 11 is inserted in the jointmember 14. The upper portion of the inner holding strip 15 is joined tothe periphery of the lower end of the joint member 14, and constitutes acontact portion 15 a of substantially dome shape which comes intocontact with the stomach wall when the stomach interior fixing member 12is positioned inside the stomach. The lower portion of the inner holdingstrip 15 is comprised of four band-shaped joint members 15 b joined tothe lower edge of the contact portion 15 a and a connecting portion 15 cfor connecting the distal end of the respective joined members 15 b.

Formed at the center portion of the upper surface of the contact portion15 a is a hole which communicates with the feed path 13 of the tubemember 11. The center portion of the upper surface of the contactportion 15 a with which the stomach wall comes into contact is formedinto a flat shape. The four joint members 15 b are provided at regularintervals in the circumferential direction at the lower end of thecontact portion 15 a, and are separated into four directions from thelower edge of the contact portion 15 a downward respectively, and thenconverged at a position below the center axis of the tube member 11 toconstitute the connecting portion 15 c, and are there fixed together.

In other words, the connecting portion 15 c connects the respectivejoint members 15 b with each other by joining the lower end portions ofthe respective joint members 15 b, and is positioned at a lower locationof the center axis of the tube member 11 by the respective joint members15 b. Therefore, the inner holding strip 15 is formed into substantiallya spherical shape as a whole with the pairs of opposing joint members 15b, 15 b, and the outline of the contact portion 15 a forms a circlerespectively.

The contact portion 15 a and the respective joint members 15 b areformed of soft elastic material having flexibility, and are maintainedin a substantially spherical shape as a whole as shown in FIG. 1 andFIG. 2 in the normal state by this elasticity. However, when theconnecting portion 15 c is pressed downward, it is expanded to astraight elongated state. In comparison with the portions of the contactportion 15 a which correspond to the respective joint members 15 b, theportions other than the above-described portions are thinner from thelower end to the upper end.

Therefore, the contact portion 15 a is constructed of the portionsextending from the joint members 15 b and the thinned portionstherebetween, and hence when the connecting portion 15 c is pulleddownward, it is folded to specified shape and is easily narrowed into anelongated shape. The connecting portion 15 c is formed at the centerthereof with a hole, and an engaging portion 16 of a short cylindricalshape is fixed to this hole. The engaging portion 16 is formed at thecenter thereof with a hole 16 a for positioning the distal portion of arod (see FIG. 3) 21 described later. The stomach interior fixing member12 configured as described above has a function to be fixed to the innersurface of the stomach wall of the patient and prevent the gastrostomytube 10 from being separated from the patient's body.

The gastrostomy tube extension device 20 according to the firstembodiment includes a rod 21 as the extender, a fixing member 22, and anengaging member 23 according to the present invention as shown in FIG.3. The rod 21 has a main body 21 a formed of a rod-shaped member,possibly of stainless steel, and a holding portion 21 b, possibly formedof plastic. The main body 21 a is provided with a pushing portion 29,possibly of plastic, attached at the distal end thereof. The pushingportion 29 includes a secured portion 29 a fixed to the main body 21 ain a state of covering the peripheral surface of the lower end portionof the main body 21 a, and a push-insertion piece 29 b extendingdistally from the lower end of the secured portion 29 a.

The outer diameter of the secured portion 29 a is set to be larger thanthe diameter of the hole 16 a of the engaging portion 16 provided on thegastrostomy tube 10, and the diameter of the push-insertion piece 29 bis set to be smaller than the diameter of the hole 16 a. Therefore, whenthe rod 21 is inserted downward from an upper opening 13 a of the feedpath 13 of the tube member 11, the push-insertion piece 29 b is insertedinto the hole 16 a, and the secured portion 29 a is located in such amanner that its lower surface is positioned on the upper surface of theengaging portion 16. Accordingly, when the rod 21 is pressed downwardinto the gastrostomy tube 10, the stomach interior fixing member 12extends and narrows.

A cylindrical portion 24 configured integrally with the holding portion21 b is formed on the upper portion of the main body 21 a and below theholding portion 21 b so as to cover the circumference of the main body21 a, and engaging stepped portions 24 a as the positioning portions ofthe present invention are formed on the outer peripheral surfacethereof. Each engaging stepped portion 24 a is a ring-shaped projectionof substantially triangular shape in vertical cross-section formed onthe peripheral surface of the cylindrical portion 24 along thecircumference thereof, and three of these engaging stepped portions 24 aare formed at intervals along the axial direction of the cylindricalportion 24. The upper surface of the holding portion 21 b may be formedinto a curved surface depressed into an arcuate shape for allowing theoperator's hand or finger, in particular, the thumb, to fit foroperation.

The fixing member 22 may be formed of stainless steel, and a main body22 a is formed into a cylindrical shape. The main body 22 a is formedwith an engaging projection 25 on the outer peripheral surface on theupper end of the main body 22 a. The engaging projection 25 includes atapered portion 25 a the diameter of which is smaller toward its loweredge and gradually increases toward the top. The portion above thetapered portion 25 a is formed so as to gradually decrease in diameter,so that a stepped portion is formed at the interface with the taperedportion 25 a. The engaging projection 25 constitutes both the fixedportion and the engaged portion of the present invention. Formed on theupper end of the main body 22 a is a ring-shaped holding portion 22 bhaving the outer diameter larger than that of the main body 22 a.

The fixing member 22 is mounted to the main body 21 a by covering theouter peripheral surface of the main body 21 a of the rod 21 as shown inFIG. 4, and in this state, it is movable along the longitudinaldirection of the main body 21 a. The main body 22 a of the fixing member22 is adapted to be inserted into the feed path 13 of the tube member11, and the engaging projection 25 is adapted to be press-fitted intothe feed path 13 of the tube member 11. When the main body 22 a isinserted into the tube member 11, the fixing member 22 is fixed to thetube member 11 by the engagement between the tube member 11 and theengaging projection 25.

The engaging member 23 may be formed into a shape as shown in FIG. 3 bymachining a stainless steel plate, and includes a lower engaging portion26 as the engaging portion of the present invention, and an upperengaging portion 27 as the positioned portion of the present invention.The lower engaging portion 26 and the upper engaging portion 27 areconnected by a joint strip 28 of a vertically elongated rectangularplate shape. The lower engaging portion 26 includes a holding strip 26 aof substantially U-shape in plan view, and a pair of claw portions 26 b,and the holding strip 26 a is formed so as to extend from the lower endof the joint strip 28 horizontally toward the near side of the drawingand orthogonally to the joint strip 28.

The claw portions 26 b are provided in parallel with the holding strip26 a so as to extend from both sides of the lower end portion of thejoint strip 28, orthogonally to the joint strip 28 and at a distancefrom the holding strip 26 a. The inside of the substantially U-shape ofthe holding strip 26 a is formed into a recess which can clamp theportion corresponding to the tapered portion 25 a of the engagingprojection 25 in the state of being press-fitted into the tube member 11as shown in FIG. 1.

The upper engaging portion 27 is formed so as to extend from the upperend of the joint strip 28 horizontally toward the near side of thedrawing and orthogonally to the joint strip 28, and is configured by alaterally elongated part extending from both sides of the joint strip28. The length of the upper engaging portion 27 in the fore-and-aftdirection is set to be short, and is formed at the front center with anengaging recess 27 a which can engage the respective engaging steppedportions 24 a. A pair of projections 27 b for preventing the engagementwith the engaging stepped portion 24 a from being released projectdownward at both sides of the engaging recess 27 a and at the frontportion of the upper engaging portion 27. In addition, both sideportions of the upper engaging portion 27 are curved downwardly so as tofacilitate operation performed with the operator's hand hooked thereon,and the distal portion of the holding strip 26 a is curved upward so asto prevent engagement with the engaging projection 25 from beingreleased.

The gastrostomy tube extension device 20 in this arrangement is used forinserting the gastrostomy tube 10 into the hole formed on the abdomen ofthe patient or taking out the same from the hole. The case of taking outthe gastrostomy tube 10 from the hole will first be described here. FIG.5 shows the gastrostomy tube 10 a in use. The gastrostomy tube 10 a hasa long tube member 11 a and includes a connecting member 17 forconnecting a feeding tube (not shown) for feeding nutrient preparationinto the gastrostomy tube 10 a connected to the upper end thereof. Theconnecting member 17 includes two feeding ports 17 a, 17 b, and thefeeding ports 17 a, 17 b are openable and closable by corresponding lids18 a, 18 b, respectively.

The lower portion of the gastrostomy tube 10 a constitutes thegastrostomy tube 10 described above, with the lower portion of the tubemember 11 a positioned at the hole formed between the abdominal wall andthe stomach wall of the patient and the stomach interior, and withfixing member 12 placed in the patient's stomach. When feeding fluidsubstance such as liquid food or nutrient preparation to the patient,the predetermined feeding ports 17 a, 17 b at the connecting member 17at the proximal end of the tube member 11 a extending toward the outsidethe body are opened and the feeding tube is connected to the feedingports 17 a, 17 b.

In this state, nutrient preparation is fed to the patient with thisfeeding tube and the gastrostomy tube 10 a. In this case, the fluidsubstance fed out of the lower opening of the tube member 11 a entersinto the stomach from the stomach interior fixing member 12 passingthrough the spaces between the joint members 15 b. After use, thefeeding tube is disconnected from the connecting member 17, and thefeeding ports 17 a, 17 b are closed with the lids 18 a, 18 b. Whenreplacement of the gastrostomy tube 10 a is necessary after apredetermined period of use, the tube member 11 a is cut at a positionindicated by a broken line “a” in FIG. 5. Accordingly, the gastrostomytube 10 remains in the patient's body.

Subsequently, as shown in FIG. 4, the rod 21 provided with the fixingmember 22 attached thereto is inserted downward from the upper opening13 a of the tube member 11. In this case, the operator holds the holdingportion 22 b with his/her hand and presses the main body 22 a of thefixing member 22 into the tube member 11 so that the engaging projection25 is fixed to the upper end of the tube member 11. Then, thepush-insertion piece 29 b of the rod 21 is aligned with the engagingportion 16 of the stomach interior fixing member 12 and pushed into thehole 16 a. Subsequently, the holding strip 26 a of the lower engagingportion 26 is engaged with the outer peripheral surface of the tubemember 11 at the engaging projection 25, and the engaging member 23 isconnected to the rod 21 to which the gastrostomy tube 10 and the fixingmember 22 are attached, in a state in which the main body 21 a ispositioned in the engaging recess 27 a to obtain the state shown in FIG.1.

Subsequently, in a state in which the operator holds the upper surfaceof the holding portion 21 b by hand to prevent the push-insertion piece29 b from separating from the hole 16 a, the operator hooks his fingerswith the lower surface of the upper engaging portion 27 and pulls theengaging member 23 upward, so that the edge of the engaging recess 27 ais engaged with the predetermined engaging stepped portion 24 a, forexample, the engaging stepped portion 24 a located at the center.Accordingly, as shown in FIG. 6, the stomach interior fixing member 12extends straight and is narrowed, and hence the tube member 11 and thestomach interior fixing member 12 form the shape similar to one singlerod. In this case, not only the stomach interior fixing member 12, butalso the tube member 11 is brought into an extended state.

The gastrostomy tube 10 and the gastrostomy tube extension device 20 areassembled in a state in which the engaging projection 25 is preventedfrom separating from the holding strip 26 a by the curved portion at thedistal end of the holding strip 26 a, and the engaging stepped portion24 a of the rod 21 is prevented from coming apart from the engagingrecess 27 a by the projections 27 b. Then, the gastrostomy tube 10 istaken out from the hole on the patient by pulling the rod 21 in a statein which the gastrostomy tube 10 is extended as shown in FIG. 6. In thiscase, since the stomach interior fixing member 12 is elongated andnarrowed, the removal of the gastrostomy tube 10 can be performedsmoothly.

When the gastrostomy tube 10 has been taken out from the patient, theoperator hooks his/her fingers with the lower surface of the upperengaging portion 27, and pulls the engaging member 23 upward, wherebythe engaging recess 27 a is removed from the engaging stepped portion 24a and the holding strip 26 a is removed from the engaging projection 25,so that the engaging member 23 is removed from the gastrostomy tube 10and the rod 21. Then, the rod 21 is taken out from the gastrostomy tube10 to complete the removal operation. The used gastrostomy tube 10 isdisposed, and the gastrostomy tube extension device 20 is used again forthe next process.

Since the gastrostomy tube extension device 20 according to the presentembodiment is configured as described above, the rod 21 including thefixing member 22 attached thereto is inserted into the tube member 11 ofthe gastrostomy tube 10, so that the engaging projection 25 of thefixing member 22 is fixed to the upper end of the tube member 11. Then,the engaging member 23 is pulled upward in a state in which the lowerengaging portion 26 is engaged with the outer peripheral surface of thetube member 11 at the engaging projection 25 to cause the upper engagingportion 27 to be engaged the predetermined engaging stepped portion 24a, whereby the stomach interior fixing member 12 is maintained in annarrowed state. Therefore, the operator who conducts a surgicaloperation can concentrate on the insertion or removal operation withoutpaying attention to the extended state of the gastrostomy tube 10 fortreatment. Consequently, the operation to insert the gastrostomy tube 10into the hole on the patient or to take out the same from the hole isfacilitated.

In this case, since the fixing member 22 is formed into a cylindricalshape, and hence moves along the longitudinal direction of the main body21 of the rod 21, the operation can be facilitated, and an adequateextension of the gastrostomy tube 10 is achieved. In addition, since thefixing member 22 is fixed to the tube member 11 by the engagingprojection 25, and the holding strip 26 a of the engaging member 23engages the engaging projection 25 so as to clamp the tube member 11,fixation of the fixing member 22 to the tube member 11 is furtherensured. Furthermore, since the tube member 11 is brought into a firmcontact with the outer peripheral surface of the main body 22 a of thefixing member 22 when it is extended to a certain extent, and hence isprevented from excessively extending, a force to push the rod 21 isefficiently used for extension of the stomach interior fixing member 12.

Also, the distal end of the holding strip 26 a of the lower engagingportion 26 is curved upward and hence it is hard for the engagingprojection 25 to separate from the lower engaging portion 26, and thepair of the projections 27 b are provided on the opening edge of theengaging recess 27 a at the front portion of the upper engaging portion27, so that it is hard for the engaging stepped portion 24 a of the rod21 to separate from the upper engaging portion 27. Therefore, thegastrostomy tube extension device 20 maintains the gastrostomy tube 10in the extended state stably without accidental disconnection of thegastrostomy tube extension device 20 from the gastrostomy tube 10.

Furthermore, since the three of the engaging stepped portions 24 areprovided at regular intervals, the gastrostomy tube 10 can be extendedin three-step lengths. Therefore, versatility is provided, and henceinsertion or removal operation of various types of gastrostomy tubes canbe performed by one type of gastrostomy tube extension device 20. Sincethe engaging stepped portion 24 a for engaging the engaging recess 27 acan be selected according to the expansion or other physical propertiesof the gastrostomy tube 10, operation in the optimal state is achieved.

Second Embodiment

FIG. 7 through FIG. 9 show a gastrostomy tube extension device 30according to a second embodiment of the present invention. A fixingmember 32 provided on the gastrostomy tube extension device 30 includesan engaging projection 35 formed on the outer peripheral surface of themain body 32 a at a position slightly lower than the center portion asshown in FIG. 9. The engaging projection 35 includes a tapered portion35 a, the diameter of which is smaller toward the distal end andgradually increases toward the proximal end, and a tapered portion 35 bwhich is formed proximally to the tapered portion 35 a so as to bevertically symmetric. Regarding the engaging member 33, the verticallength of a joint strip 38 is set to be longer than the engagingprojection 35 of the fixing member 32 by a distance corresponding to thedownward movement of the engaging projection 35 of the fixing member 32.

The structures of other portions of the gastrostomy tube extensiondevice 30 are the same as the corresponding portions of the gastrostomytube extension device 20. Therefore, the same parts are represented bythe same reference numerals and their descriptions will be omitted. Inthis arrangement, in the gastrostomy tube extension device 30, theholding strip 26 a of the engaging member 33 holds the portion of thetube member 11 lower than the center portion, and engages the engagingstrip 35. Therefore, fixation of the fixing member 32 to the tube member11 is further ensured. According to the gastrostomy tube extensiondevice 30, operation for inserting the gastrostomy tube provided with along tube as shown in FIG. 5 into the hole on the patient isfacilitated. Other effects and advantages of the gastrostomy tubeextension device 30 are the same as the aforementioned gastrostomy tubeextension device 20.

Third Embodiment

FIG. 10 through FIG. 12 show a gastrostomy tube expansion device 40according to a third embodiment of the present invention. In a rod 41provided on the gastrostomy tube extension device 40, an engagingstepped portion 44 a is formed of a ring-shaped projection formed on theouter peripheral surface of a cylindrical portion 44 having asemi-circular vertical cross-section, and five of those projections areformed along the axis of the cylindrical portion 44 at regularintervals.

As shown in FIG. 12, a fixing portion 42 is formed of a cylindricalmember the diameter of which is set to be larger toward the lower edge,and gradually decreases toward the upper portion thereof, and is fixedto the outer peripheral surface of the tube member 11 of the gastrostomytube 10 at the upper end portion thereof. The lower surface of thefixing portion 42 constitutes an engaging projection 45. A lowerengaging portion 46 of an engaging member 43 is constituted of the framebody including a holding piece 46 a and a claw portion 46 b formedcontinuously and integrally with each other.

The structures of other portions of the gastrostomy tube extensiondevice 40 are the same as the corresponding portions of the gastrostomytube extension device 20. Therefore, the same parts are represented bythe same reference numerals and descriptions thereof will not be made.In this arrangement, in the gastrostomy tube extension device 40, sincethe structure of the fixing portion 42 is extremely simplified,manufacture can be facilitated, and the cost is reduced. Also, since theoperation for fixing the fixing portion 42 to the gastrostomy tube 10 isnot necessary, the operation of the device during a surgical operationis simplified. Other effects and advantages of the gastrostomy tubeextension device 40 are the same as the aforementioned gastrostomy tubeextension device 20.

Fourth Embodiment

FIG. 13 shows a fixing portion 52 provided on the gastrostomy tubeexpansion device according to a fourth embodiment of the presentinvention. The fixing portion 52 includes an engaged portion 53 whichhas the same structure as the aforementioned fixing portion 42 and aninner reinforcing member 54. The inner reinforcing member 54 is formedby molding resin, and includes a cylindrical portion 54 a which can bepress-fitted into the tube member 11 and a flange-shaped holding portion54 b provided at the upper end of the cylindrical portion 54 a.

The structures of other portions of the gastrostomy tube extensiondevice provided with the fixing portion 52 are the same as thecorresponding portions of the gastrostomy tube extension device 40(third embodiment). In this arrangement, the cylindrical portion 54 a ofthe inner reinforcing member 54 comes into firm contact with the innerperipheral surface of the tube member 11, so that extension of the tubemember 11 is restrained. Accordingly, the tube member 11 is preventedfrom becoming damaged. Other effects and advantages of the gastrostomytube extension device provided with the fixing portion 52 are the sameas the aforementioned gastrostomy tube extension device 40.

Fifth Embodiment

FIG. 14 and FIG. 15 show a fixing portion 62 provided on the gastrostomytube extension device according to a fifth embodiment of the presentinvention. The fixing portion 42 includes an engaged portion 63 havingsubstantially the same shape as the aforementioned fixing portion 42 andbeing smaller than the fixing portion 62 and a connector 64 detachablyengaging the engaged portion 63. A connector 64 includes a pair of jointstrips 66 a, 66 b which are capable of rotating with respect to eachother about a hinge joint 65, and the distal ends of the joint strips 66a, 66 b are provided with engaging portions 67 a, 67 b which can beconnected to and detached from each other through one-touch operation.The joint strips 66 a, 66 b are configured to form a cylindrical memberwhich can cover the outer peripheral surface of the tube member 11 whenthe engaging portions 67 a, 67 b are engaged.

The joint strips 66 a, 66 b are formed on the inner circumferencesurface with an engaging groove 68 which can engage the engaged portion63, and the joint strips 66 a, 66 b are formed with a pair of engagingprojections 69 a, 69 b on the outer peripheral surface thereof. Theengaging projections 69 a, 69 b are adapted to be capable of engagingthe lower engaging portion 26 provided on the aforementioned engagingmember 23. The structures of other portions of the gastrostomy tubeextension device provided with the fixing portion 62 are the same as thecorresponding portions of the gastrostomy tube extension device 20(first embodiment). In this structure, engagement between the engagedportion 63 which is fixed to the tube member 11, and the engaging member23 can further be ensured. Since the engaged portion 63 is a smallmember, resistance generated when the portion of the tube member 11formed with the engaged portion 63 is passed through the hole on thepatient is small, and hence it can easily be passed through. Othereffects and advantages of the gastrostomy tube extension device providedwith the fixing portion 62 are the same as the aforementionedgastrostomy tube extension device 20.

Sixth Embodiment

FIG. 16 shows an engaged portion 72 as the fixing portion provided onthe gastrostomy tube extension device according to a sixth embodiment ofthe present invention. The engaged portion 72 includes a recess formedon the outer peripheral surface of the tube member 11. The recess whichconstitutes the engaged portion 72 is formed into a tapered-shape, thediameter of which is larger toward the lower end and gradually decreasestoward the upper end, and the upper end portion is formed with a steppedportion 72 a. The lower engaging portion provided on the engaging member(not shown) is provided with a narrow holding strip which can engage thestepped portion 72 a.

The structures, effects and advantages of the other portions of thegastrostomy tube extension device provided with the engaged portion 72are the same as the corresponding portion of the gastrostomy tubeextension device 20 (first embodiment). In this arrangement, since it isnot necessary to provide a separate fixing member, the structure issimplified and low cost to manufacture.

Seventh Embodiment

FIG. 17 and FIG. 18 show a state in which a gastrostomy tube extensiondevice 80 according to a seventh embodiment of the present invention ismounted to the gastrostomy tube 10. In the gastrostomy tube extensiondevice 80, the fixing member and the engaging member are formed to be anintegrally formed movable fixing member 81 shown in FIG. 19, and themovable fixing member 81 includes a fixing member 82 and an engagingportion 83. The fixing portion 82 is formed with an engaging projection85 on the outer peripheral surface of the lower end portion of acylindrical main body 82 a. The engaging projection 85 includes twotapered portions 85 a formed consecutively in the vertical direction,the diameter of the engaging projection 85 being smaller toward thedistal end and gradually increasing toward the proximal end.

The engaging portion 83 includes a holding portion 87 formed of alaterally elongated plate member connected to the upper end of the mainbody 82 a, and a cylindrical engaged portion 88 connected to the centerportion of the upper surface of the holding portion 87 as the positionedportion of the present invention. The holding portion 87 is configuredin such a manner that the projection 27 b is eliminated from the upperengaging portion 27 and a hole (not shown) is formed so as tocommunicate with the hole of the main body 82 a instead of the engagingrecess 27 a. The cylindrical engaged portion 88 includes an elasticresin material having retractility, and can be moved to a predeterminedportion of the engaging stepped portion 24 a provided on the rod 21 andengaged.

The structures, effects and advantages of other portions of thegastrostomy tube extension device 80 are the same as the correspondingportions of the gastrostomy tube extension device 20 (first embodiment).Therefore, the same parts are represented by the same reference numeralsand descriptions thereof will be omitted. In this arrangement,engagement between the engaging portion 83 and the rod 21 can be easilyachieved by pushing the cylindrical engaged portion 88 into the engagingstepped portion 24 a. Since the fixing member and the engaging memberare integrally formed in the movable fixing member 81, the structure maybe simplified and hence the cost may be lowered.

Eighth Embodiment

FIG. 20 shows an eighth embodiment of the present invention, and thegastrostomy tube extension device according to this embodiment furtherincludes a clip 89 a as a tightening member according to the presentinvention in addition to the aforementioned gastrostomy tube extensiondevice 80 (seventh embodiment). The clip 89 a may be formed of a linearresilient member formed into an omega (Ω) shape as shown in FIG. 21, andis mounted to an engaging projection 85 of the gastrostomy tubeextension device 80 attached to the gastrostomy tube 10 via the tubemember 11 as shown in FIG. 20. The structures of other portions of thegastrostomy tube extension device provided with the clip 89 a are thesame as the corresponding portions of the gastrostomy tube extensiondevice 80. Therefore, the same parts are represented by the samereference numerals and description will be omitted.

In this arrangement, the tube member 11 is pressed against the engagingprojection 85 by the clip 89 a with a stronger force, and is fixedlysecured by the fixing portion (82) of the movable fixing member 81.Other effects and advantages of the gastrostomy tube extension deviceprovided with the clip 89 a are the same as the aforementionedgastrostomy tube extension device 80. FIG. 22 shows a clip 89 b as amodification of the tightening member. This clip 89 b is formed of aplate-shaped resilient member formed substantially into a U-shape, andis formed with a substantially circular recess 89 c which can press thetube member 11 against the engaging projection 85 at the inner side ofthe recess. In this arrangement as well, the same effects and advantagesas the clip 89 a are obtained.

Ninth Embodiment

FIG. 23 and FIG. 24 show a state in which a gastrostomy tube extensiondevice 90 according to a ninth embodiment of the present invention isattached to the gastrostomy tube 10. In this gastrostomy tube extensiondevice 90, the fixing member and the engaging member are composed of amovable fixing member 91 shown in FIG. 25 and a tightening screw 99shown in FIG. 26. The movable fixing member 91 includes a fixing member92 and an engaging portion 93 as in the aforementioned movable fixingmember 81. In this fixing member 92, an engaging projection 95 of thesame structure as the engaging projection 85 is formed at the lower endof a cylindrical main body 92 a on the outer peripheral surface thereof,and a threaded portion 99 a having an outer diameter larger than that ofthe main body 92 a or the engaging projection 95 is formed on the upperend of the main body 92 a. The vertical length of the fixing portion 92is set to be the same as the vertical length of the fixing portion 82.

The engaging portion 93 includes a holding portion 97 having the samestructure as the engaging portion 83, and a cylindrical engaged portion98. Then, the tightening screw 99 includes a cylindrical metallic screwmember which can be screwed with the threaded portion 99 a, and isprovided with a rough surface for preventing slippage. The tighteningscrew 99 is screwed onto the threaded portion 99 a of the fixing portion92 whose main body 92 a has been press-fitted into the tube member 11,so that the tube member 11 is pressed against the engaging projection95, whereby fixation between the tube member 11 and the fixing portion92 is further strengthened. The structures of other portions of thegastrostomy tube extension device 90 are the same as the correspondingportions of the gastrostomy tube extension device 80. Therefore, thesame parts are represented by the same reference numerals anddescriptions thereof will be omitted. The effects and advantages of thegastrostomy tube extension device 90 are the same as the gastrostomytube extension device provided with the aforementioned clip 89 a or theclip 89 b.

The gastrostomy tube extension device according to the present inventionis not limited to the aforementioned embodiments, and may be modified inimplementation within the technical scope of the present invention. Forexample, although the engaging stepped portions 24 a, 24 a are formed onthe rods 21, 41 respectively, and the engaging recess 27 a whichdetachably engages the engaging stepped portions 24 a, 44 a and otherparts are provided respectively on the engaging member 23 in theaforementioned respective embodiments, these members can be omitted. Inthis case, the operator operates the upper engaging portion 27 holdingthe same with his/her hand. Since the upper engaging portion 27 or thelike is configured of the holding portion which is convenient forholding by hand, the operation is facilitated, to the point that evenindividuals who wish to maintain their gastrostomy tubes themselves maydo so in the comfort of their own homes, without the help of doctors ornurses. The holding portion is not limited to the shape as the upperengaging portion 27, and it is also possible to extend the tube member11 by holding the holding portion 22 b or the fixing portion 42 or thelike directly by hand and pulling the same.

When providing the engaging stepped portions 24 a, 44 a, the numberthereof is not limited to three or five, and may be other plural numbersor may be single. The spacing of the engaging stepped portions 24 a, 44a may be irregular or regular, as is optional for the human body. Thecross-sectional shape of the engaging stepped portion 24 a or the likeis not limited to semi-circle or triangle, and may be various shapes.The engaging stepped portion may be a projection projecting from apredetermined portion of the cylindrical portion instead of aring-shape, or may be a recess with which the upper engaging portion canengage instead of the ring-shape. The shapes and the materials of otherportions which constitute any embodiments of the gastrostomy tube 10 orthe respective gastrostomy tube extension device 20 or the like may alsobe changed as needed without departing from the scope of the invention.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a front view showing a gastrostomy tube extension deviceaccording to a first embodiment of the present invention is mounted to agastrostomy tube.

FIG. 2 is a perspective view of the gastrostomy tube.

FIG. 3 is an exploded perspective view showing the respective memberswhich constitute the gastrostomy tube extension device.

FIG. 4 is a front view showing a fixing member mounted to a rod.

FIG. 5 is a front view showing the gastrostomy tube placed in apatient's body.

FIG. 6 is a front view showing the gastrostomy tube extended with thegastrostomy tube extension device.

FIG. 7 is a front view showing the gastrostomy tube extension deviceaccording to a second embodiment of the present invention, mounted tothe gastrostomy tube.

FIG. 8 is a front view showing the gastrostomy tube extended by thegastrostomy tube extending device shown in FIG. 7.

FIG. 9 is a front view showing the mounting member, mounted to a rodprovided on the gastrostomy tube extension device shown in FIG. 7.

FIG. 10 is a front view showing the gastrostomy tube extension deviceaccording to a third embodiment of the present invention, mounted to thegastrostomy tube.

FIG. 11 is a front view showing the gastrostomy tube expanded by thegastrostomy tube extension device shown in FIG. 10.

FIG. 12 is a front view showing a fixing portion provided on thegastrostomy tube extension device shown in FIG. 10, fixed to thegastrostomy tube.

FIG. 13 is a cross-sectional view showing an inner reinforcing memberprovided on the gastrostomy tube extension device according to a fourthembodiment of the present invention, mounted to a tube member.

FIG. 14 is a cross-sectional view showing a connector provided on thegastrostomy tube extension device according to a fifth embodiment of thepresent invention.

FIG. 15 is a plan view of the connector shown in FIG. 14.

FIG. 16 is a front view showing an engaged portion provided on thegastrostomy tube extension device according to a sixth embodiment of thepresent invention.

FIG. 17 is a front view showing the gastrostomy tube extension deviceaccording to a seventh embodiment of the present invention, mounted tothe gastrostomy tube.

FIG. 18 is a front view showing the gastrostomy tube extended by thegastrostomy tube extension device shown in FIG. 17.

FIG. 19 is a front view showing a movable fixing member mounted to therod provided on the gastrostomy tube extension device shown in FIG. 17.

FIG. 20 is a front view showing the gastrostomy tube extension deviceaccording to an eighth embodiment of the present invention, mounted tothe gastrostomy tube.

FIG. 21 is a plan view showing a clip provided on the gastrostomy tubeextension device shown in FIG. 20.

FIG. 22 is a plan view showing the clip according to a modification.

FIG. 23 is a front view showing the gastrostomy tube extension deviceaccording to a ninth embodiment of the present invention, mounted to thegastrostomy tube.

FIG. 24 is a front view showing the gastrostomy tube extended by thegastrostomy tube extension device shown in FIG. 23.

FIG. 25 is a front view showing the movable fixing member mounted to therod provided on the gastrostomy tube extension device shown in FIG. 23.

FIG. 26 is a front view showing a tightening screw.

The invention claimed is:
 1. A gastrostomy tube extension device usedfor inserting or taking out a gastrostomy tube into/from a hole in apatient, the gastrostomy tube comprising a stomach interior fixingmember to be installed inside the stomach wall at a hole formed betweenthe outer surface of a patient's skin and the inner surface of thestomach wall, and a tube member connected to the stomach interior fixingmember and extended through the hole to the outside of the patient'sbody, the gastrostomy tube extension device comprising: an extendercomprising a rod-shaped member which can be inserted into the tubemember and can elongate and narrow the stomach interior fixing member bydirectly pushing the distal end of the stomach interior fixing membertoward the distal side of the device with the distal end of rod-shapedmember; a fixing member which is capable of moving along thelongitudinal direction of the extender while being fixed to the outsideend of the tube member and being inside the tube member, where theoutside end of the tube member is the end located out of the body; anengaging portion which is engageable with the fixing member; an engagingmember having the engaging portion that is engageable with the fixingmember and a holding portion for holding by hand for operation andelongating the stomach interior fixing member when the holding portionis pulled in the direction of the outside end of the tube member whilethe extender is inserted in the tube member and the engaging portion isengaged with the fixing member fixed to the outside end of the tubemember; and wherein the fixing member is hollow cylindrical, surroundingthe outer peripheral surface of the extender and capable of moving alongthe longitudinal direction of the extender, and a cylindrical member isformed with a fixed portion to be fixed at the end of the tube memberwhich is located out of the body and an engaged portion to be engagedwith the engaging portion of the engaging member.
 2. The gastrostomytube extension device according to claim 1, wherein the fixed portion isformed of a projection which is formed on the outer peripheral surfaceof the cylindrical member so as to be capable of being press-fitted intothe tube member.
 3. The gastrostomy tube extension device according toclaim 2, wherein the projection which constitutes the fixed portion isformed of a projection formed on the outer peripheral surface of thecylindrical member along the circumference thereof having a taperedportion the diameter of which is smaller at the distal end whenpress-fitted into the tube member and gradually increases toward theproximal end.
 4. The gastrostomy tube extension device according toclaim 3, wherein the engaged portion is formed of the projection whichconstitutes the fixed portion, and the engaging portion of the engagingmember is adapted to engage the outer peripheral surface of the tubemember through which the cylindrical member is press-fitted so as to fixthe fixed portion at a portion corresponding to the engaged portion. 5.The gastrostomy tube extension device according to claim 1, wherein aplurality of the positioning portions are formed along the axialdirection of the extender.
 6. A gastrostomy tube extension device usedfor inserting or taking out a gastrostomy tube into/from a hole on apatient, the gastrostomy tube comprising a stomach interior fixingmember to be installed inside of a stomach wall at a hole formed betweenthe outer surface of the patient's skin and the inner surface of thestomach wall, and a tube member connected to the stomach interior fixingmember and extending through the hole to the outside of the patient'sbody, the gastrostomy tube extension device including; an extenderformed of a rod-shaped member which can be inserted into the tube memberand can elongate and narrow the stomach interior fixing member bydirectly pushing the distal end of the stomach interior fixing membertoward the distal side of the device by the distal portion of therod-shaped member; a movable fixing member which directly contacts afixing portion which is capable of being fixed to the outside end of thetube member and a holding portion to be held by hand for operation ofthe device, wherein the movable fixing member is movable along thelongitudinal direction of the extender when inside the tube member, andwhere the outside end of the tube member is the end located out of thebody; and wherein the fixing portion of the movable fixing member ishollow cylindrical and movable along the longitudinal direction of theextender when surrounding the outer peripheral surface of the extender,and on a cylindrical member is formed a fixed portion to be fixed on theend of the tube member which is located out of the body.
 7. Thegastrostomy tube extension device according to claim 6, wherein thefixed portion may be formed on the outer peripheral surface of thecylindrical member and formed by projections which can be press-fittedinto the tube member.
 8. The gastrostomy tube extension device accordingto claim 7, wherein the projection comprising the fixed portion may beformed on the outer peripheral surface of the cylindrical member alongthe circumference thereof, and may comprise a tapered portion thediameter of which is smaller toward the distal end when press-fittedinto the tube member and gradually increases toward the proximal end. 9.The gastrostomy tube extension device according to claim 8, wherein atightening member is provided for constricting the outer peripheralsurface of the tube member through which the cylindrical member ispress-fitted, and where the fixed portion is fixed, in order tostrengthen the fixation of the fixed portion to the tube member.
 10. Agastrostomy tube extension device used for inserting or taking out agastrostomy tube into/from a hole on a patient, the gastrostomy tubecomprising a stomach interior fixing member to be installed inside of astomach wall at a hole formed between the outer surface of the patient'sskin and the inner surface of the stomach wall, and a tube memberconnected to the stomach interior fixing member and extending throughthe hole to the outside of the patient's body, the gastrostomy tubeextension device including; an extender formed of a rod-shaped memberwhich can be inserted into the tube member and can elongate and narrowthe stomach interior fixing member by directly pushing the distal end ofthe stomach interior fixing member toward the distal side of the deviceby the distal portion of the rod-shaped member; and a movable fixingmember which directly contacts a fixing portion which is capable ofbeing fixed to the outside end of the tube member and a holding portionto be held by hand for operation of the device, wherein the movablefixing member is movable along the longitudinal direction of theextender when inside the tube member, and where the outside end of thetube member is the end located out of the body; wherein a positioningportion is formed on the peripheral surface of the proximal portion ofthe extender, and the movable fixing member is provided with apositioned portion which can engage the positioning portion, so thatwith the extender inserted into the tube member, the stomach interiorfixing member is elongated and narrowed when the tube member is engagedwith the fixing portion and the positioning portion is engaged with thepositioned portion respectively with the extender inserted into the tubemember; and wherein the positioning portion is formed with a pluralityof projections formed along the axial direction of the extender and thepositioned portion is constituted of a cylindrical member formed ofelastic material, and the positioned portion can be engaged with thepredetermined portion of the positioning portion.